{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "08f0fb13",
   "metadata": {},
   "source": [
    "-------\n",
    "* 2022/10/24/ week10\n",
    "* Python学习记录：许丹\n",
    "-------"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "80aa85be",
   "metadata": {},
   "source": [
    "# 本周学习目标\n",
    "> 1.while循环  \n",
    "> 2.购物车实践"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "335e43be",
   "metadata": {},
   "source": [
    "## 1.while循环\n",
    "* 回顾：for循环：for+range()可以指定循环的次数-->关于网页URL队列的抓取实践  \n",
    "* while循环：当某种条件成立时，停止循环  \n",
    "* while True：无限循环/死循环"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "70bd35b2",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "你是风儿我是沙，缠缠绵绵到天涯... 0\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 1\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 2\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 3\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 4\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 5\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 6\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 7\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 8\n",
      "你是风儿我是沙，缠缠绵绵到天涯... 9\n"
     ]
    }
   ],
   "source": [
    "# 1.指定次数\n",
    "count=0\n",
    "while True:\n",
    "    print(\"你是风儿我是沙，缠缠绵绵到天涯...\",count)\n",
    "    count = count+1\n",
    "    if count == 10:\n",
    "        break # break 终止循环"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "9dddccbb",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "'break' outside loop (95959154.py, line 18)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  Input \u001b[1;32mIn [17]\u001b[1;36m\u001b[0m\n\u001b[1;33m    break\u001b[0m\n\u001b[1;37m    ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m 'break' outside loop\n"
     ]
    }
   ],
   "source": [
    "# 2.while True循环，可以让用户重复输入\n",
    "user01 =\"admin\"\n",
    "password01 = \"123456\"\n",
    "count = 0 #计数器\n",
    "\n",
    "while True:\n",
    "    username = input(\"账号:\")\n",
    "    password = input(\"密码:\")\n",
    "    if user01 == username and password01 == password:\n",
    "        print(\"登陆成功~欢迎\"+user01)\n",
    "        break   # 中止循环\n",
    "# 情景二：账号不存在或密码不正确，用户可以输入三次，三次后1小时之后再来尝试\n",
    "else:\n",
    "    if count<2:\n",
    "        print(\"账号不存在或密码不正确，请重新输入！您还有\"+str(2-count)+\"次尝试的机会\")\n",
    "    else:\n",
    "        print(\"账号不存在或密码不正确！请1小时后再来尝试\")\n",
    "        break\n",
    "    count = count+1"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5e233489",
   "metadata": {},
   "source": [
    "## 2.购物车项目"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "68a67cec",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
      "1\n",
      "2\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "for i in range(4):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 73,
   "id": "a2ca601d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入余额：100\n",
      "---------商品列表--------\n",
      "商品序号: 0 柠檬水 6元\n",
      "商品序号: 1 蜜桃四季春 10元\n",
      "商品序号: 2 芒果奶盖 12元\n",
      "商品序号: 3 葡萄啵啵奶茶 8元\n",
      "请输入商品编号：3\n",
      "商品购买成功，正在制作中...您的余额还有92元\n",
      "---------商品列表--------\n",
      "商品序号: 0 柠檬水 6元\n",
      "商品序号: 1 蜜桃四季春 10元\n",
      "商品序号: 2 芒果奶盖 12元\n",
      "商品序号: 3 葡萄啵啵奶茶 8元\n",
      "请输入商品编号：q\n",
      "您已购买的商品： [8]\n",
      "您的余额还有92,欢迎下次光临~~~\n"
     ]
    }
   ],
   "source": [
    "# 1.运行程序后，让用户输入支付宝余额√，然后打印我们的商品列表给用户。√\n",
    "\n",
    "product_list = [\n",
    "    [\"柠檬水\",6],\n",
    "    [\"蜜桃四季春\",10],\n",
    "    [\"芒果奶盖\",12],\n",
    "    [\"葡萄啵啵奶茶\",8],\n",
    "]\n",
    "shopping_car = []\n",
    "Alipay = int(input(\"请输入余额：\"))\n",
    "\n",
    "while True:\n",
    "    print(\"---------商品列表--------\")\n",
    "    for i in range(4):\n",
    "        print(\"商品序号:\",i,product_list[i][0],str(product_list[i][1])+\"元\")  # 格式化输出\n",
    "    # 2.让用户输入商品编号进行商品的购买（列表）。：直接用商品列表的index作为商品标号\n",
    "    user_choice = input(\"请输入商品编号：\")\n",
    "    # 情景1：用户正在购买，输入商品编号    \n",
    "    if user_choice.isdigit():\n",
    "       # 情景一：余额大于商品价格\n",
    "      if  Alipay >= product_list[int(user_choice)][1]:\n",
    "            Alipay = Alipay - product_list[int(user_choice)][1]\n",
    "            shopping_car.append(product_list[int(user_choice)][1])\n",
    "            print(\"商品购买成功，正在制作中...您的余额还有%s元\"%(Alipay))\n",
    "     # 情景二：余额小于商品价格\n",
    "      else:\n",
    "        print(\"您的余额不足，请更换支付方式~~~~\")\n",
    "    #  情景2：用户输入退出，结束购买\n",
    "    elif user_choice ==\"q\":\n",
    "        print(\"您已购买的商品：\",shopping_car)\n",
    "        print(\"您的余额还有%s,欢迎下次光临~~~\"%(Alipay))\n",
    "        break"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 72,
   "id": "a42fd41b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "execution_count": 72,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 假设用户选择了0\n",
    "product_list[0][1]\n",
    "# 用户选择的商品价格：product_list[user_choice][1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7819e262",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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